1 files changed, 20 insertions, 12 deletions

diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index 0a45490f4029..c2b19c111718 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -1508,11 +1508,13 @@ static void free_counter(struct perf_counter *counter)
 {
         perf_pending_sync(counter);
 
-        atomic_dec(&nr_counters);
-        if (counter->attr.mmap)
-                atomic_dec(&nr_mmap_counters);
-        if (counter->attr.comm)
-                atomic_dec(&nr_comm_counters);
+        if (!counter->parent) {
+                atomic_dec(&nr_counters);
+                if (counter->attr.mmap)
+                        atomic_dec(&nr_mmap_counters);
+                if (counter->attr.comm)
+                        atomic_dec(&nr_comm_counters);
+        }
 
         if (counter->destroy)
                 counter->destroy(counter);
@@ -3515,6 +3517,8 @@ static void sw_perf_counter_destroy(struct perf_counter *counter)
 {
         u64 event = counter->attr.config;
 
+        WARN_ON(counter->parent);
+
         atomic_dec(&perf_swcounter_enabled[event]);
 }
 
@@ -3551,8 +3555,10 @@ static const struct pmu *sw_perf_counter_init(struct perf_counter *counter)
         case PERF_COUNT_SW_PAGE_FAULTS_MAJ:
         case PERF_COUNT_SW_CONTEXT_SWITCHES:
         case PERF_COUNT_SW_CPU_MIGRATIONS:
-                atomic_inc(&perf_swcounter_enabled[event]);
-                counter->destroy = sw_perf_counter_destroy;
+                if (!counter->parent) {
+                        atomic_inc(&perf_swcounter_enabled[event]);
+                        counter->destroy = sw_perf_counter_destroy;
+                }
                 pmu = &perf_ops_generic;
                 break;
         }
@@ -3663,11 +3669,13 @@ done:
 
         counter->pmu = pmu;
 
-        atomic_inc(&nr_counters);
-        if (counter->attr.mmap)
-                atomic_inc(&nr_mmap_counters);
-        if (counter->attr.comm)
-                atomic_inc(&nr_comm_counters);
+        if (!counter->parent) {
+                atomic_inc(&nr_counters);
+                if (counter->attr.mmap)
+                        atomic_inc(&nr_mmap_counters);
+                if (counter->attr.comm)
+                        atomic_inc(&nr_comm_counters);
+        }
 
         return counter;
 }